Understand application requirements and parameters
The beginning of everything is always to understand the problem to be solved. For coaxial cable purchases, this means knowing the quality of the signal the cable needs to carry. Some of the important factors are the frequency range and the power level of the transmitted signal. Other factors include the RF and electromagnetic environment through which the signal travels, the length of the wiring, and the difficulty of wiring. Project budget and all institutional requirements also play an important role in the decision regarding the particular coaxial cable chosen for an application.
Correct choice of impedance
The two main impedances used in coaxial cables are 75 ohms and 50 ohms. The impedance of a coaxial cable cannot be determined from the outside unless it has visible markings. If the above two impedances are confused, it may cause damage to the device connector or the device itself, or at least degrade the system performance. Although sometimes used crossover, 75-ohm cables are often used for video applications, while 50-ohm cables are more commonly used for data and wireless purposes. The type of equipment and components that need to be connected determines the cable impedance to be used.